Related Clues:

• One has to be grateful for a letter like this
• Not a sweet detective matter
• Gamble on a letter
• There's nothing base about a century I had
• The hundred I had makes it a biting, detective matter
• So corrosive that it's a matter for the detectives
• The odds are a letter is in second place
• 21 down needs the first letter to make the second letter
• Put your money on a letter for a second place
• Sounds as if one might get the better of a letter
• Just be grateful it's only a second letter
• Wager a letter to come second
• The way to wager with a letter?
• So biting as to be a detective matter
• Wager a letter, but not in the first place